Merging Gedcoms

Merging Gedcoms

I have Reunion on my iMac, Touch and MacBook. I carry my Touch w/I research and add information I've found, references, etc. I carry my MacBook when I travel and when I find things in hotel rooms while surfing, I enter that, too.

My questions is how do I merge it all together in all three of my databases??? Does a Gedcom merge into another Gedcom or does it act as a separate file?

It's nice having all three devices, but I can see that I don't have the same information on all three of them! I have over 10K individuals on my database (after 20+ years of researching) so going thru it to check facts, etc, is an impossibility!

I'd love to get an iPad. Does the Reunion App work on it? Does anybody know?